Question
Carry out Maria Agnesi's proof of the Quotient Rule from her bookon calculus, published in $178 :$ Assume that $f, g$ and $h=f / g$ are differentiable. Compute the derivative of $h g=f$ using the Product Rule,and solve for $h^{\prime} .$
Step 1
We differentiate both sides with respect to $x$ using the product rule on the right side. The product rule states that the derivative of a product of two functions is the derivative of the first function times the second function plus the derivative of the second Show more…
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Carry out Maria Agnesi's proof of the Quotient Rule from her book on calculus, published in 1748 . Assume that $f, g$ and $h=f / g$ are differentiable. Compute the derivative of $h g=f$ using the Product Rule, and solve for $h^{\prime} .$
DIFFERENTIATION
Product and Quotient Rules
(a) Use the Product Rule twice to prove that if $f, g,$ and $h$ are differentiable, then $(f g h)^{\prime}=f g h+f g^{\prime} h+f g h^{\prime}.$ (b) Taking $f-g=h$ in part (a), show that $$ \frac{d}{d x}[f(x)]^{\prime}=3(f(x)]^{2} f^{\prime}(x) $$ (c) Use part (b) to differentiate $y=e^{1x}.$
Differentiation Rules
The Product and Quotient Rules
Verify that, if $f, g, h$ are differentiable, then $$(f g h)^{\prime}(x)=f^{\prime}(x) g(x) h(x)+f(x) g^{\prime}(x) h(x)+f(x) g(x) h^{\prime}(x)$$ HINT: Apply the product rule to $[f(x) g(x)] h(x)$.
The Derivative; The Process of Differentiation
Some Differentiation Formulas
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